t2 init -i will throw an error

[johnnyman727]

The interactive option for initializing a JavaScript project (t2 init -i) throws an error:

➜  t2-demo t2 init -i
INFO Initializing new Tessel project for JavaScript...
INFO Created package.json.
ERR! [TypeError: Cannot read property 'trim' of undefined]

The error is being thrown by this line. Adding another check for a falsy value of d allows you to interactively create a package.json but the spinner awkwardly blocks the text being typed.

The fix for this bug would be to fix that check on d and fix the spinner blocking stdin text.